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STAFF COSTS (Details 4) - Share
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Granted during the period 944,468    
Long term incentive plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 1 January 2,611,200 1,999,800 0
Granted during the period 907,300 866,600 2,127,400
Exercised during the period 0 0 0
Expired during the period (764,000) (233,900) 0
Forfeited during the period (35,400) (21,300) (127,600)
Outstanding 31 December 2,719,100 2,611,200 1,999,800
Exercisable 31 December 255.3 255.3 538.9